The FBI wiretapped Paul Manafort, Trump's former campaign chairman, both before and after the election, CNN reports. According to the report, those taps were active during a "period when Manafort was known to talk" to President Trump, but not at the time Manafort attended a meeting with Donald Trump Jr. and a Russian lawyer.
Three sources told CNN the investigators were concerned Manafort had "encouraged Russians to help with the campaign."
The taps were authorized by a FISA court, per CNN, a step that requires high-level approval and significant documentation. A storage facility belonging to Manafort was also searched.
The investigation into Manafort began in 2014, over consulting work he did in Ukraine. He is now a central focus of Robert Mueller's investigation. He has denied any wrongdoing.
Another bombshell, per the NY Times: after agents executed a search of Manafort's home in July, prosecutors "told Mr. Manafort they planned to indict him."